1. What is the Water Flow Rate Formula?

Definition: This calculator determines the mass flow rate of water based on heat transfer rate, specific heat capacity, and temperature change.

Purpose: It's commonly used in HVAC systems, boiler calculations, and thermal engineering to determine required water flow rates.

2. How Does the Formula Work?

The formula used is:

Where:

• \( \dot{m} \) — Mass flow rate (pounds per hour)
• \( Q \) — Heat transfer rate (BTU per hour)
• \( c \) — Specific heat capacity (BTU per pound per °F)
• \( \Delta T \) — Temperature change (°F)

Explanation: The formula calculates how much water mass must flow to achieve the desired heat transfer at the given temperature difference.

3. Importance of Water Flow Rate Calculation

Details: Proper flow rate calculation ensures efficient heat transfer, prevents system overload, and helps in proper pump sizing.

4. Using the Calculator

Tips: Enter the heat transfer rate in BTU/h, specific heat capacity (default 1.0 BTU/lb·°F for water), and temperature change in °F. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the specific heat capacity of water?
A: For water, it's typically 1.0 BTU/lb·°F, but can vary slightly with temperature and impurities.

Q2: How do I find the heat transfer rate?
A: This is typically known from system specifications or can be calculated from other thermal parameters.

Q3: What if I'm using a fluid other than water?
A: Use the specific heat capacity for your particular fluid - most calculators have reference values available.

Q4: Why is temperature change important?
A: Greater temperature differences require less flow for the same heat transfer, and vice versa.

Q5: Can this be used for cooling calculations?
A: Yes, the same formula applies for both heating and cooling applications.